I am stuck on this please help!

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол

Which is the value of this expression when p=3 and q=-9

Brainliest! write a verbal expression to represent the given equation. 4n-3=21